1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef CRYPTO_SECURE_HASH_H_ 6#define CRYPTO_SECURE_HASH_H_ 7 8#include <stddef.h> 9 10#include <memory> 11 12#include "base/macros.h" 13#include "crypto/crypto_export.h" 14 15namespace crypto { 16 17// A wrapper to calculate secure hashes incrementally, allowing to 18// be used when the full input is not known in advance. 19class CRYPTO_EXPORT SecureHash { 20 public: 21 enum Algorithm { 22 SHA256, 23 }; 24 virtual ~SecureHash() {} 25 26 static std::unique_ptr<SecureHash> Create(Algorithm type); 27 28 virtual void Update(const void* input, size_t len) = 0; 29 virtual void Finish(void* output, size_t len) = 0; 30 virtual size_t GetHashLength() const = 0; 31 32 // Create a clone of this SecureHash. The returned clone and this both 33 // represent the same hash state. But from this point on, calling 34 // Update()/Finish() on either doesn't affect the state of the other. 35 virtual std::unique_ptr<SecureHash> Clone() const = 0; 36 37 protected: 38 SecureHash() {} 39 40 private: 41 DISALLOW_COPY_AND_ASSIGN(SecureHash); 42}; 43 44} // namespace crypto 45 46#endif // CRYPTO_SECURE_HASH_H_ 47